title: Analysis of expressed sequence tags from Uromyces appendiculatus hyphae and haustoria and their comparison to sequences from other rust fungi.
abstract: Hyphae, 2 to 8 days postinoculation (dpi), and haustoria, 5 dpi, were isolated from Uromyces appendiculatus infected bean leaves (Phaseolus vulgaris cv. Pinto 111) and a separate cDNA library prepared for each fungal preparation. Approximately 10,000 hyphae and 2,700 haustoria clones were sequenced from both the 5' and 3' ends. Assembly of all of the fungal sequences yielded 3,359 contigs and 927 singletons. The U. appendiculatus sequences were compared with sequence data for other rust fungi, Phakopsora pachyrhizi, Uromyces fabae, and Puccinia graminis. The U. appendiculatus haustoria library included a large number of genes with unknown cellular function; however, summation of sequences of known cellular function suggested that haustoria at 5 dpi had fewer transcripts linked to protein synthesis in favor of energy metabolism and nutrient uptake. In addition, open reading frames in the U. appendiculatus data set with an N-terminal signal peptide were identified and compared with other proteins putatively secreted from rust fungi. In this regard, a small family of putatively secreted RTP1-like proteins was identified in U. appendiculatus and P. graminis.
authors.affiliation: Soybean Genomics and Improvement Lab, USDA-ARS, Beltsville, MD 20705, USA.
authors.forename: D P
authors.initials: DP
authors.lastname: Puthoff
authors.forename: A
authors.initials: A
authors.lastname: Neelam
authors.forename: M L
authors.initials: ML
authors.lastname: Ehrenfried
authors.forename: B E
authors.initials: BE
authors.lastname: Scheffler
authors.forename: L
authors.initials: L
authors.lastname: Ballard
authors.forename: Q
authors.initials: Q
authors.lastname: Song
authors.forename: K B
authors.initials: KB
authors.lastname: Campbell
authors.forename: B
authors.initials: B
authors.lastname: Cooper
authors.forename: M L
authors.initials: ML
authors.lastname: Tucker
mesh_terms: D000595:Amino Acid Sequence; D001487:Basidiomycota / Q000235:genetics*; D020451:Contig Mapping; D017931:DNA Primers; D018076:DNA, Complementary / Q000235:genetics; D004271:DNA, Fungal / Q000235:genetics; D018744:DNA, Plant / Q000235:genetics; D020224:Expressed Sequence Tags; D005656:Fungal Proteins / Q000235:genetics; D016681:Genome, Fungal; D025301:Hyphae / Q000235:genetics*; D008969:Molecular Sequence Data; D016366:Open Reading Frames; D018515:Plant Leaves / Q000235:genetics* / Q000382:microbiology; D012331:RNA, Fungal / Q000235:genetics / Q000302:isolation & purification; D018749:RNA, Plant / Q000235:genetics; D020133:Reverse Transcriptase Polymerase Chain Reaction; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid
chemical_list: D017931:DNA Primers; D018076:DNA, Complementary; D004271:DNA, Fungal; D018744:DNA, Plant; D005656:Fungal Proteins; D012331:RNA, Fungal; D018749:RNA, Plant